From 985e65d3864fa6a8575c9bb0f76ea8089eab72fc Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 24 Jun 2010 12:06:34 -0600
Subject: [PATCH] Metadata download: Make cover check multithreaded

---
 src/calibre/ebooks/metadata/fetch.py | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/calibre/ebooks/metadata/fetch.py b/src/calibre/ebooks/metadata/fetch.py
index e7883d3757..0fd671f86a 100644
--- a/src/calibre/ebooks/metadata/fetch.py
+++ b/src/calibre/ebooks/metadata/fetch.py
@@ -287,15 +287,19 @@ class HeadRequest(urllib2.Request):
     def get_method(self):
         return "HEAD"
 
-def check_for_covers(items):
+def do_cover_check(item):
     opener = browser()
-    for item in items:
-       item.has_cover = False
-       try:
-            opener.open(HeadRequest(OPENLIBRARY%item.isbn), timeout=5)
-            item.has_cover = True
-       except:
-           pass # Cover not found
+    item.has_cover = False
+    try:
+        opener.open(HeadRequest(OPENLIBRARY%item.isbn), timeout=5)
+        item.has_cover = True
+    except:
+        pass # Cover not found
+
+def check_for_covers(items):
+    threads = [Thread(target=do_cover_check, args=(item,)) for item in items]
+    for t in threads: t.start()
+    for t in threads: t.join()
 
 def search(title=None, author=None, publisher=None, isbn=None, isbndb_key=None,
            verbose=0):